90 LOGGING 
When the feUing crew does the log-making, one sharp saw is 
provided each day, otherwise a sharp saw is furnished every other 
day. 
Saws filed daily are serviceable for a period of from two to 
four months and are then turned over to road-making crews and 
other laborers who do not require high-grade tools. 
POWER FELLING MACHINES 
There has not a been a satisfactory power-driven tree-felling 
machine placed on the market. Machines of various types have 
been patented and offered for sale but they have not proved of 
practical value. 
Devices such as drag, circular and endless-chain saws operated by 
steam, electricity, compressed-air or gasoline power have been 
devised, but they have all been too heavy and bulky for transpor- 
tation in the forest. Their weight is not only a handicap in getting 
the machine around through brushy woods and over rough 
bottom, but also prevents their rapid removal from the vicinity 
of falling timber where they are continually subject to damage. 
POWER LOG-MAKING MACHINES 
On comparatively level land in an open forest composed of 
large trees, drag saws, called "steam dagos" driven by compressed 
air have been used successfully for " bucking" logs. 
The equipment consists of a traction engine with an air com- 
pressor and an air storage tank. The saw, which may be at- 
tached readily to a log of any size, is driven by a piston working 
in a small cylinder, mounted on a metal frame weighing from 60 
to 75 pounds. The cylinder is connected with the air chamber 
on the engine by a line of hose of sufficient length to give a working 
radius of 300 feet. Three frames and one saw are the usual 
equipment for an outfit. 
Drag saws mounted on skids and driven by a small gasoline 
engine^ or by steam power are used extensivel}^ in the West 
to buck logs into fire-wood lengths for logging engine use. 
The maximum capacity is approximately 25 cords daily. Gaso- 
line-driven saws also have been used successfully in the South 
^ Usually from 3 to 4 horse power. 
